i bought a new to me 05 yz450f after i sold my yz400f. after riding it around for the first time i was kind of dissapointed with the power. my 400 was built and very fast and im wanting a liitle more of that violent power of the 400 out of the 450. i did some searching and was wondering if i could swap a 04 cdi or get an aftermarket one. has anyone done this or have an experience with aftermarket cdi's. and i already put a full dr.d step system and a jd jet kit. thanks.